That's it! Thanks! It works like in my Win7. I dragged out Ethernet Status to the desktop to make an icon there. Clicking on it, I van disable or reenable the Ethernet connection.
If I am working a long time on, e.g., a text document, I usually do not need the Internet. Then I prefer to disconnect from it for reasons of privacy (such as tracking) and security (sniffing in my computer) and so on. Then I prefer to keep MicroCIA out.